CN106840246A - A kind of vibrating string type sensor work condition on-line testing method and device - Google Patents
A kind of vibrating string type sensor work condition on-line testing method and device Download PDFInfo
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- CN106840246A CN106840246A CN201710220153.0A CN201710220153A CN106840246A CN 106840246 A CN106840246 A CN 106840246A CN 201710220153 A CN201710220153 A CN 201710220153A CN 106840246 A CN106840246 A CN 106840246A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
Abstract
The invention discloses a kind of vibrating string type sensor work condition on-line testing method and device, readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument sends；After judging that accumulation signal terminates, the induction coil that measurement vibrating string type sensor is produced；Induction coil after being terminated according to the accumulation signal or accumulation signal calculates the result about vibrating string type sensor system work condition and shows.Measurement result of the present invention can definitely reflect the work condition of sensing system, not influenceed by physics measuring value；The present invention is with parameters such as the electric currents on sensing system course of work synchronism detection voltage between lines and circuit, the excitaton source of test signal takes from readout instrument, without the input signal on sensing system, therefore can realize in X -ray inspection X, be capable of the overall process of dynamic measurement sensor system work.
Description
Technical field
The present invention relates to a kind of vibrating string type sensor work condition on-line testing method and device.
Background technology
The element of vibrating string type sensor system includes sensor, signal cable and readout instrument.Wherein, sense
Device is typically made up of the string wire that can be vibrated, single coil excitement and a fixing end.Coil two ends are drawn by signal cable, are seen
Fig. 3.
Sensor surveys physical quantity such as stress, pressure etc. can change the intrinsic natural frequency of vibration of string wire, can be passed through by readout instrument
Signal cable connection sensor is measured.Usually readout instrument is applied by signal cable at cell winding two ends first
One accumulation signal, string wire forced oscillation in sensor, and continue damped oscillation after stopping applying accumulation signal.Now string wire
Mechanical oscillation electrical signal of reaction is converted into by coil, readout instrument is back to by cable.By readout instrument to signal meter frequently,
The natural frequency of vibration of string wire can be measured.The scope of the general frequency is 500~5000Hz, and corresponding signal voltage amplitude is left in 1mV
The right side, and accumulation signal voltage amplitude is general in more than 5V.
After vibrating string type sensor is in installation process or using a period of time, sensor or signal cable are possible to impaired
Cause sensor cannot normal work, or reading is incorrect.Biography is evaluated generally by the stability of duplicate reading at present
The measured value reliability of sensor, but reading stability is typically only capable of reflecting the size of accidental error, and the degree of accuracy can not be reflected, thus
By duplicate reading method can not thoroughly evaluating sensor accuracy, can not equally judge whether the change of reading accurate
Reflect real physical quantity variation.Therefore in the middle of practice, when reading changes, analysis personnel are often made to be difficult in thing
Accurately judgement is made between reason amount real change and sensor failure.
In addition to using the method for duplicate reading, prior art also tests the total of coil and cable using general universal meter
D.C. resistance provides the conclusion whether cable or coil break to judge the quality of sensing system DC channel, sees figure
4.But the method still has limitation, reason is, vibrating string type sensor is to represent physical quantity with the frequency signal for exchanging, and resistance
It is not the deciding factor for restricting accuracy of reading.For example to general vibrating string type sensor, coil resistance in 300 Ω or so,
The resistance of cable can change in the range of 0 ~ 1000 Ω and sensor remains to normal work.Except non-test to resistance in practice
In more than 100k Ω, can substantially determine it is disconnection fault, in the case where resistance value is not obvious exception, using universal meter without
Whether method provides the normal definite conclusion of instrument work；On the other hand, universal meter is only capable of measuring D.C. resistance, and frequency signal
Decay is related to AC impedance, and D.C. resistance can not completely represent the performance of cable transmission signal, easily cause erroneous judgement.Therefore
When actually used universal meter is tested, the resistance of some instruments is very big, but still reading is normal, and some normal instrument of resistance measured value
Device but cannot reading, it is impossible to accurately judge whether instrument fails, and cannot more realize being carried out in the case where readout instrument is accessed online
Test.
General purpose oscialloscope and the online observed reading instrument accumulation signal of frequency spectrograph and induced signal can also be used in theory
Waveform and frequency spectrum, but it is preceding addressed, the induced signal voltage amplitude of sensor is only 1mV, not only in the presence of up to 5V on circuit
Accumulation signal, and it is mingled with a large amount of interference signals, in the case where above-mentioned signal cannot be excluded, directly use oscillograph and frequency spectrograph
It is difficult to observe by the induced signal waveform or frequency spectrum of sensor.Oscillograph or frequency spectrograph on-line checking cannot be used in thus putting into practice
The working condition of vibrating string type sensor, can not only apply accumulation signal by the built-in waveform of readout instrument or spectrum measurement function
When measure induced signal, but this mode destroys the independency principle of detection, it is impossible to exclude the survey that readout instrument failure is caused
Amount problem, for many occasions, such as readout instrument producer and model it has been determined that or sensor access be with multichannel read
The automatic collecting system of number ability, does not allow to change readout instrument yet or acquisition system carrys out detection sensor..
Traditional sensor states evaluation meanses rely primarily on duplicate reading, and sensor shape is speculated with the stability of reading
The quality of state.This method has significant limitations, because reading stability is typically only capable of the size of reflected measurement accidental error, and
The reflected measurement degree of accuracy is unable to, stable reading is not that sensor measures accurate adequate condition；On the other hand due to physics quantitative change
Change can also cause reading to change, stable reading nor sensor measures accurate necessary condition, thus found that when reading is unstable
Sensor performance variation is often difficult to differentiate between to cause or there occurs real physical quantity variation.Measured using traditional universal meter
The resistance of cell winding or circuit, need to form measuring loop by universal meter internal current source, and can be defeated during readout instrument work
Go out accumulation signal, therefore readout instrument cannot normal work during using measuring resistance by using universal meter, it is impossible to realize on-line measurement.
At present, the working condition of detection vibrating string type sensor lacks direct efficient apparatus, causes sensor states evaluation to be stranded
It is difficult.The professional standard for coming into force for 2013《DL/T1271-2013 vibrating-wire monitor device identification technology code》, it is proposed that to passing
The authentication method of sensor, but still be that the Measurement results of readout instrument in sensor based system are analyzed, it is this by system
The measurement data of inner assembly of uniting has significant limitation evaluating the method for whole system state, easily by each component in system
Between influence and cause erroneous judgement, shortage can independently, directly obtain reflection system work condition independent quantitative index side
Method.
Therefore, in face of the install sensor that quantity is increasingly huger, it is badly in need of a kind of objective, accurate, independent, directly survey
Trial work section, the work condition for evaluating vibrating string type sensor.
The content of the invention
The technical problems to be solved by the invention are, in view of the shortcomings of the prior art, providing a kind of vibrating string type sensor work
Condition on-line testing method and device.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of vibrating string type sensor work condition
On-line testing method, comprises the following steps：
1）Readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument sends；
2）After judging that accumulation signal terminates, the induction coil that measurement vibrating string type sensor is produced；
3）Induction coil after being terminated according to the accumulation signal or accumulation signal calculates relevant vibrating string type sensor system
The result of the condition that works simultaneously shows the result.
Step 1）In, the voltage amplitude of the accumulation signal that survey measurements instrument sends, current amplitude, voltage waveform, current wave
One kind in shape.
Step 2）In, the condition that accumulation signal terminates is that accumulation signal amplitude occurs level triggers, or accumulation signal ripple
Shape does not influence the measurement of the induction coil.
Step 2）In, the mode of the induction coil that measurement vibrating string type sensor is produced is first to carry out condition control to signal
Amplitude fading processed, then be amplified.
Step 3）In, the result of vibrating string type sensor system work condition is after being terminated by accumulation signal and accumulation signal
The impedance of the measurement circuitry under induced signal frequency that induction coil is calculated, or after being terminated by accumulation signal
The discrete waveform DS that induction coil is formed after analog-to-digital conversion, or the coil sense after being terminated by accumulation signal
The wave-shape amplitude value that the discrete waveform DS that induction signal is formed after analog-to-digital conversion is calculated, or by accumulation signal
The waveform frequency value that the discrete waveform DS that induction coil after end is formed after analog-to-digital conversion is calculated, or
Person is that the discrete waveform DS that the induction coil after being terminated by accumulation signal is formed after analog-to-digital conversion is calculated
Wave-shape amplitude rate of decay value, or induction coil after being terminated by accumulation signal formed after analog-to-digital conversion from
The duration value of exemplary amplitude scope in wave-shape amplitude attenuation process that scattered Wave data series is calculated, or by
Accumulation signal terminate after the noise that calculates of the discrete waveform DS that is formed after analog-to-digital conversion of induction coil
Than, or the discrete waveform DS that induction coil after being terminated by accumulation signal is formed after analog-to-digital conversion calculates
The frequency spectrum for drawing.
Correspondingly, present invention also offers a kind of vibrating string type sensor work condition online testing device, including：
Accumulation signal pick-up circuit：For in the measurement circuitry that sensor and readout instrument are constituted by the characteristic information of accumulation signal
It is transformed to standard electric signal；
Controlled amplifier circuit：Control logic electric signal according to controller, induction coil after accumulation signal is terminated
Characteristic information is transformed to standard electric signal；
Controller：For judging whether accumulation signal terminates, and to controlled amplifier circuit and arithmetic processor output control logic
Electric signal；
Arithmetic processor：For the control logic electric signal according to controller, measurement represent accumulation signal standard electric signal and
Accumulation signal terminate after representative induction coil characteristic information standard electric signal, and to the standard electric signal at
Reason obtains the result about vibrating string type sensor system work condition；
Display：For showing the result that arithmetic processor is obtained.
The characteristic information of the accumulation signal includes in voltage amplitude, current amplitude, voltage waveform, current waveform
Kind.
The accumulation signal pick-up circuit includes amplitude detection circuit, and the amplitude detection circuit is differential with low speed low power to be put
Big device connection；Or the accumulation signal pick-up circuit includes the current sampling resistor width in parallel with the current sampling resistor
Degree detecting circuit, the amplitude detection circuit is connected with low speed low power differential amplifier；Or the accumulation signal pick-up circuit
Including high speed low power differential amplifier；Or the accumulation signal pick-up circuit include high speed low power differential amplifier and with it is described
High speed low power differential amplifier current sampling resistor in parallel.
The controlled amplifier circuit includes a signal amplification circuit, and the signal amplification circuit input connects controlled letter
Number amplitude fading circuit.
The controlled amplifier circuit includes differential amplifier, and the differential amplifier is connected with voltage cut-out, described
Voltage cut-out is connected with the control logic electrical signal of controller；The controller includes level trigger.
The controller includes digital signal processor, and the digital signal processor receives the number of analog-digital converter output
Word signal.
The result about vibrating string type sensor system work condition includes the representative coil after being terminated by accumulation signal
The discrete waveform DS that the standard electric signal of induced signal characteristic information is obtained by analog-to-digital conversion；Or it is described about shaking
The result of string type sensor system work condition includes the representative induction coil characteristic information after being terminated by accumulation signal
The amplitude of the relevant waveform that standard electric signal is calculated by the discrete waveform DS that analog-to-digital conversion is obtained, frequency,
One kind during amplitude decay rates, amplitude fading in the duration of exemplary amplitude scope, signal to noise ratio, frequency spectrum；Or institute
The result stated about vibrating string type sensor system work condition includes standard electric signal and accumulation signal by representing accumulation signal
Two groups of discrete waves that the standard electric signal of the representative induction coil characteristic information after end is obtained by analog-to-digital conversion respectively
The impedance of measurement circuitry under the induced signal frequency that graphic data series is calculated.
The arithmetic processor includes arithmetic unit, and the arithmetic unit receives the data signal of analog-digital converter output.
Compared with prior art, the advantageous effect of present invention is that：Measurement result of the present invention can definitely reflect sensing
The work condition of device system, is not influenceed by physics measuring value；It is proposed by the present invention about work condition test result be normally
Sensing system is in the necessary condition of state working properly, and any test result is abnormal to that should have definite sensor fault
Reason, can accurately point out sensor measurement accuracy to be deteriorated or fail, and without relying upon the analysis to physics measuring value, and this
The achievement of a little test events is not easy to be disturbed by physical quantity variation.For example, the resistance in the impedance value of measurement circuitry it is too small or
It is excessive, show there is short circuit or open circuit in loop, sensor can be influenceed to normally receive accumulation signal, and readout instrument receives sensing
Signal；Inductive reactance in measurement circuitry impedance value is too small, shows cell winding internal short-circuit, influences exciting and induced signal
Pickup；Condensance in measurement circuitry impedance value is too small, shows that transmission line has ac short circuit, can influence induced signal
Transmission；Induced signal wave-shape amplitude is too small, the duration of exemplary amplitude scope is too short and waveform attenuating speed is excessive can
Influence the degree of accuracy of frequency measurement；The signal to noise ratio of induced signal is too small, frequency spectrum is excessively in disorder, can influence the stability of measured value.
The above results can directly reflect the work condition of sensor, once thus certain test event obtains abnormal knot in test process
Really, you can draw the conclusion that sensor accuracy class is affected or has failed, and can designate that trouble unit and failure are former
Cause；The present invention is with the parameters such as the electric current on sensing system course of work synchronism detection voltage between lines and circuit, test letter
Number excitaton source take from readout instrument, without the input signal on sensing system, therefore can realize in X -ray inspection X, can be dynamic
The overall process of measurement sensor system work；The present invention possesses the energy that accumulation signal is directly judged whether from measurement circuitry
Power, the information without obtaining the sensing system course of work by readout instrument, can be changed without including the sensing including readout instrument
Test job is completed on the premise of any component of device system.
Brief description of the drawings
Fig. 1 is the inventive method flow chart；
Fig. 2 is the present invention relates to part that device is included；
Fig. 3 is the element of vibrating string type sensor；
Fig. 4 is the schematic diagram that tradition detects vibrating string type sensor using universal meter；
Fig. 5 is one embodiment of accumulation signal pick-up circuit, pick-up voltage amplitude；
Fig. 6 is one embodiment of accumulation signal pick-up circuit, picks up current amplitude；
Fig. 7 is one embodiment of accumulation signal pick-up circuit, pick-up voltage waveform；
Fig. 8 is one embodiment of accumulation signal pick-up circuit, picks up current waveform；
Fig. 9 is one embodiment of controller, and range signal is converted into level triggers signal；
Figure 10 is one embodiment of controller, and waveform signal is converted into discrete waveform series, judges whether there is on test line
Accumulation signal；
Figure 11 is one embodiment of arithmetic processor, the control logic electric signal according to controller, by the standard of accumulation signal
The standard electric signal of representative induction coil characteristic information after electric signal and accumulation signal terminate is converted to discrete waveform system
Row, and carry out processing the result obtained about vibrating string type sensor system work condition；
Figure 12 is one embodiment of induced signal controlled amplifier circuit, output be induced signal waveform；
Figure 13 is one embodiment of apparatus of the present invention, by simplifying function reduction hardware spending；
Figure 14 is one embodiment of apparatus of the present invention, is realized by more rich hardware configuration multi-functional；
Figure 15 is the normal vibrating string type sensor induction voltage waveform output measured using the present invention；
Figure 16 is the improper vibrating string type sensor induction voltage waveform output measured using the present invention；
Mark in the figures above is respectively：
1-accumulation signal pick-up circuit, 2-controlled amplifier circuit, 3-controller, 4-arithmetic processor, 5-controller swash
Shake signal input part, the control signal input of 6-controlled amplifier circuit, the accumulation signal input of 7-arithmetic processor,
8-induced signal input, the control signal input of 9-arithmetic processor, 10-sensor, 11-readout instrument, 12-
Display, 50-string wire, 51-fixing end, 52-single coil excitement, 53-signal cable, 54-universal meter, 101-amplitude detection
Circuit, 102-low speed low power differential amplifier, 103-current sampling resistor, 104-high speed low power differential amplifier, 201-
Voltage cut-out, 202-differential amplifier, 301-level trigger, 302-accumulation signal analog-digital converter, 303-number
According to bus, 304-digital signal processor, 401-accumulation signal analog-digital converter, 402-induced signal analog-digital converter,
403-data/address bus, 404-arithmetic unit, 405-exciting current signal analog-digital converter, 406-exciting voltage signal modulus turns
Parallel operation.
Specific embodiment
Such as Fig. 1, the method for the present invention is comprised the following steps：
1）Readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument sends；
2）After judging that accumulation signal terminates, the induction coil that measurement vibrating string type sensor is produced；
3）Induction coil after being terminated with accumulation signal according to the accumulation signal calculates relevant vibrating string type sensor system
The result of the condition that works simultaneously shows the result.
Such as Fig. 2, at accumulation signal pick-up circuit 1, controlled amplifier circuit 2, controller 3, computing
Reason device 4 and display 12；The test signal input of accumulation signal pick-up circuit 1 and controlled amplifier circuit 2 is accessed by sensor
10 and readout instrument 11 constitute measurement circuitry in；The exciting letter of the signal output part access controller 3 of accumulation signal pick-up circuit 1
The accumulation signal input 7 of number input 5 and arithmetic processor 4；The signal output part of controlled amplifier circuit 2 accesses calculation process
The induced signal input 8 of device 4；The control signal output of controller 3 accesses the control signal input of controlled amplifier circuit 2
6 and the control signal input 9 of arithmetic processor 4；The display signal output part of arithmetic processor 4 accesses the display of display 12
Signal input part.
In concrete practice, the amplitude of the accumulation signal that the readout instrument 11 in Fig. 2 is sent is with frequency because manufacturer is different
And otherwise varied, the also difference between different manufacturers of respective sensor 10, general readout instrument and sensor select same producer
Support the use.
For ease of illustration specific embodiment, the exciting voltage amplitude for setting the readout instrument 11 in Fig. 2 is 5V, excited frequency
It is 500Hz to 5000H frequency sweeps, the output induced signal voltage of respective sensor 10 is 10mV, and resonant frequency is 2000Hz.Make
When carrying out normal reading with readout instrument 11, the loading frequency 500Hz to 5000Hz first on cable of readout instrument 11, amplitude is 5V's
Accumulation signal, when readout instrument accumulation signal frequency sweep is exported to 2000Hz or so, sensor is in resonant condition, string wire 50
Shake.After readout instrument 11 completes frequency sweep process, sensor string wire 50 continues to vibrate, and readout instrument now measures the induced signal of 10mV frequently
Rate, display frequency is the measured value of 2000Hz on readout instrument.Adding the present invention work online after form test, the present invention
The specific implementation handling process of each several part is：
Fig. 5 show one embodiment of the voltage amplitude of accumulation signal pick-up circuit pickup accumulation signal, scanning frequency excitation signal
5V voltages enter amplitude detection circuit 101 after, the AC portion of scanning frequency excitation signal is filtered out, output with accumulation signal amplitude
The direct current differential voltage of related size about 2V, after being amplified by low speed low power differential amplifier 102, being converted into can trigger control
The 2V direct current single-ended voltage signals of device 3；When no scanning frequency excitation signal, the differential voltage width of the output of amplitude detection circuit 101
Degree very little, the at most only induced signal or interference signal of tens mV, due to the multiplication factor of low speed low power differential amplifier 102
Low, the direct current single-ended voltage signal of output still only has tens mV, therefore in the measurement process of readout instrument 11, accumulation signal pickup electricity
What road exported is the single-ended voltage signal of standard.
Fig. 6 show one embodiment of the current amplitude of accumulation signal pick-up circuit pickup accumulation signal, by electric current
Sample resistance sends into amplitude detection circuit 101 after accumulation signal electric current is converted into differential voltage, and remaining is identical with Fig. 5.Electric current
The of different sizes of sample resistance can form different differential voltages, but will all turn after the adjustment of low speed low power differential amplifier 102
It is changed to the single-ended voltage signal of standard.
Fig. 7 show one embodiment of the voltage waveform of accumulation signal pick-up circuit pickup accumulation signal, by a high speed
Low power differential amplifier 104 directly amplifies accumulation signal voltage, is converted into the ripple of suitable controller 3 and the measurement of arithmetic processor 4
Shape signal.The input voltage of the analog-digital converter in normal controller 3 and arithmetic processor 4 is 2V, to expire 5V accumulation signals
The input range of sufficient analog-digital converter in this example, it is necessary to using the amplification scanning frequency excitation voltage of high speed low power differential amplifier 104, put
The bandwidth of big device 104 should be higher than that 5000Hz, and multiplication factor is 0.4.
Fig. 8 show one embodiment of the current waveform of accumulation signal pick-up circuit pickup accumulation signal, by electric current
Accumulation signal electric current is converted to and high speed low power differential amplifier 104 is sent into after differential voltage by sample resistance, remaining and Fig. 7 phases
Together.The of different sizes of current sampling resistor can form different differential voltages, but after the adjustment of high speed low power differential amplifier 104
The analog-digital converter input requirements in controller 3 and arithmetic processor 4 will all be met.
Fig. 9 show one embodiment that range signal is converted into controller 3 level triggers signal, and accumulation signal terminates
When, there was only tens mV in the single-end DC voltage of accumulation signal input 5, touched less than the 1V that level trigger 301 is set in advance
Hair thresholding, control signal output output enables signal；When having accumulation signal on circuit, in the single-ended of accumulation signal input 5
Direct current is pressed with 2V, and thresholding is triggered higher than the 1V that level trigger 301 is set in advance, and letter is forbidden in control signal output output
Number.
Figure 10 show controller 3 and waveform signal is converted into discrete waveform series, is sentenced according to discrete waveform DS
Accumulation signal is whether there is on disconnected test line, and will determine that one embodiment that result is exported through control signal output, in exciting
After the waveform signal of signal input part 5 is converted to discrete waveform series through accumulation signal analog-digital converter 302, by data/address bus
303 deliver to digital signal processor 304, calculate the amplitude of waveform series, when having accumulation signal on the line, the amplitude of waveform
It is 2V or so, higher than 1V accumulation signal amplitude Rule of judgment preset in digital signal processor 304, control signal output is defeated
Go out disable signal, when accumulation signal stops, wave-shape amplitude only has tens mV, it is preset less than in digital signal processor 304
1V accumulation signal amplitude Rule of judgment, control signal output output enables signal.
Figure 11 show control logic electric signal of the arithmetic processor 4 according to controller, by the standard telecommunications of accumulation signal
Number and accumulation signal terminate after representative induction coil characteristic information standard electric signal be converted to discrete waveform series, and
Carry out processing the one embodiment for obtaining the result about vibrating string type sensor system work condition, accumulation signal input 7
Waveform signal is converted to discrete waveform series through accumulation signal analog-digital converter 401, the waveform signal of induced signal input 8 is passed through
After induced signal analog-digital converter 402 is converted to discrete waveform series, arithmetic unit 404 is delivered to by data/address bus 403 and completes to calculate
Process.With Digital Signal Processing, the impedance of measurement circuitry under induced signal frequency, induced signal can be calculated
Duration of exemplary amplitude scope in amplitude, frequency, wave-shape amplitude rate of decay, wave-shape amplitude attenuation process, signal to noise ratio with
And frequency spectrum etc..
Specifically, signal amplitude can be extracted using numerical operation mode；Can be interior to wave period meter using the unit interval
Several methods try to achieve signal frequency；The variable quantity of signal amplitude can be extracted within the unit interval, wave-shape amplitude decay speed is obtained
Rate；Can record to terminate to drop to readout instrument to induced signal amplitude from accumulation signal and cannot measure the experienced time, obtain
The duration of exemplary amplitude scope in wave-shape amplitude attenuation process；Signal spectrum can be calculated using FFT；Can be by
Signal and the frequency characteristic of noise that FFT is obtained, calculate signal to noise ratio.The frequency of induced signal, then frequency herein can be calculated
Measurement circuitry is tried to achieve by the way of the multivariables such as instantaneous voltage, electric current carry out numerical operation under rate to accumulation signal to believe in sensing
Impedance under number frequency, and the parameter such as resistance, the reactance included in impedance.
Figure 12 show one embodiment of the waveform of the output induced signal of controlled amplifier circuit 2, voltage cut-out 201
When forbidding, signal cannot be introduced into differential amplifier 202, no signal output；It is now differential to put when voltage cut-out 201 is enabled
Induced signal waveform is amplified to big device 202 amplitude of suitable analog-digital converter sampling.In this example, the voltage amplitude of induced signal
It is 10mV to spend, and the input voltage of analog-digital converter is 2V, and the multiplication factor of corresponding differential amplifier 202 is 200 times.
Each building block of the invention can be selected in above-mentioned specific embodiment, then connect and compose this hair by each part
It is bright.Emphasis according to test is different, several embodiments of the invention presented below：
Figure 13 is one embodiment that the present invention lays particular emphasis on simplified function reduction hardware spending, there is accumulation signal on signal cable
When, the level signal of amplitude detection circuit 101 and low speed low power differential amplifier 102 output in accumulation signal pick-up circuit 1
The output disable signal of level trigger 301 in trigger controller 3, the no signal of controlled amplifier circuit 2 output, while level triggers
The disable signal of the output of device 301 enters the arithmetic unit 404 of arithmetic processor 4, and induced signal processing function stops, at accumulation signal
Reason function activation, the accumulation signal analog-digital converter 401 in accumulation signal feeding arithmetic processor 4 completes discrete waveform data system
Row conversion, calculating process is completed through the arithmetic unit 404 of arithmetic processor 4, can calculate the voltage amplitude of accumulation signal；Signal electricity
When on cable without accumulation signal, the output of level trigger 301 enables signal, the accumulation signal of arithmetic unit 404 treatment of arithmetic processor 4
Function stops, and induced signal processing function activation, the voltage cut-out 201 in controlled amplifier circuit 2 is turned on, and induced signal enters
Enter the induced signal analog-digital converter 402 sent into after differential amplifier 202 amplifies in arithmetic processor 4 and complete discrete waveform data
Series conversion, calculating process is completed through the arithmetic unit 404 of arithmetic processor 4, can calculate amplitude, frequency, the ripple of induced signal
The duration of exemplary amplitude scope, signal to noise ratio and frequency spectrum etc. in shape amplitude decay rates, wave-shape amplitude attenuation process, and will
Result of calculation is shown by display 12.
Figure 14 is that the present invention lays particular emphasis on one embodiment that most of functions are realized by more rich hardware configuration, exciting
Signal pickup circuit 1 picks up current waveform and voltage waveform simultaneously, and current waveform signal is converted to discrete waveform system by controller 3
Row, judge accumulation signal is whether there is on test line, and will determine that result is sent to controlled amplification according to discrete waveform DS
Circuit 2 and arithmetic processor 4.When having accumulation signal on signal cable, the output disable signal of controller 3, the nothing of controlled amplifier circuit 2
Signal output；Accumulation signal pick-up circuit 1 picks up the current waveform and voltage waveform that obtain respectively through exciting current signal modulus
Converter 405 and exciting voltage signal analog-digital converter 406 are kept in after being converted to discrete waveform series in arithmetic unit 404.Signal
When on cable without accumulation signal, the output of controller 3 enables signal, and the voltage cut-out 201 in controlled amplifier circuit 2 is turned on,
Induced signal enter differential amplifier 202 amplify after send into arithmetic processor 4 in induced signal analog-digital converter 402 complete from
Dissipate Wave data series conversion.Arithmetic unit 404 completes the calculating process of accumulation signal and induced signal discrete waveform DS,
Exemplary amplitude scope in amplitude, frequency, wave-shape amplitude rate of decay, the wave-shape amplitude attenuation process of induced signal can be calculated
Duration, signal to noise ratio, frequency spectrum and measurement circuitry impedance etc., and shown by display 12.The embodiment uses hardware electricity
Road is more, higher to the requirement of the computing capability of arithmetic unit 404, control logic by controller 3 digital signal processor 304 it is soft
Part is realized.Arithmetic unit 404 and digital signal processor 304 can select chip microcontroller, for the present invention, in function logic
On be in employing two single-chip microcomputers, but actual product, it would however also be possible to employ 1 single-chip microcomputer reality of mode actual selection of time-sharing multiplex
The function of existing arithmetic unit 404 and digital signal processor 304, it is cost-effective to simplify circuit.
Claims (14)
1. a kind of vibrating string type sensor work condition on-line testing method, it is characterised in that comprise the following steps：
1) readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument sends；
2) after judging that accumulation signal terminates, the induction coil that measurement vibrating string type sensor is produced；
3) induction coil after being terminated according to the accumulation signal or accumulation signal calculates relevant vibrating string type sensor system
The result of the condition that works simultaneously shows the result.
2. vibrating string type sensor according to claim 1 work condition on-line testing method, it is characterised in that step 1）
In, the one kind in voltage amplitude, current amplitude, voltage waveform, the current waveform of the accumulation signal that survey measurements instrument sends.
3. vibrating string type sensor according to claim 1 work condition on-line testing method, it is characterised in that step 2）
In, the condition that accumulation signal terminates is that accumulation signal amplitude occurs level triggers, or accumulation signal waveform does not influence the line
Enclose the measurement of induced signal.
4. vibrating string type sensor according to claim 1 work condition on-line testing method, it is characterised in that step 2）
In, the mode of the induction coil that measurement vibrating string type sensor is produced is that condition span of control limit of control decay is first carried out to signal, then
It is amplified.
5. vibrating string type sensor according to claim 1 work condition on-line testing method, it is characterised in that step 3）
In, the result of vibrating string type sensor system work condition is induction coil after being terminated by accumulation signal after analog-to-digital conversion
The discrete waveform DS of formation, or induction coil after being terminated by accumulation signal is formed after analog-to-digital conversion
The wave-shape amplitude value that discrete waveform DS is calculated, or induction coil after being terminated by accumulation signal is through mould
The waveform frequency value that calculates of discrete waveform DS formed after number conversion, or the line after being terminated by accumulation signal
The wave-shape amplitude rate of decay value that the discrete waveform DS that circle induced signal is formed after analog-to-digital conversion is calculated, or
It is that the discrete waveform DS that the induction coil after being terminated by accumulation signal is formed after analog-to-digital conversion is calculated
The duration value of exemplary amplitude scope in wave-shape amplitude attenuation process, or it is coil-induced after being terminated by accumulation signal
The signal to noise ratio that the discrete waveform DS that signal is formed after analog-to-digital conversion is calculated, or after being terminated by accumulation signal
The frequency spectrum that calculates of the discrete waveform DS that is formed after analog-to-digital conversion of induction coil, or believed by exciting
Number and the discrete waveform DS that is formed after analog-to-digital conversion of induction coil after accumulation signal terminates calculate
The impedance of the measurement circuitry under induced signal frequency.
6. a kind of vibrating string type sensor work condition online testing device, it is characterised in that including：
Accumulation signal pick-up circuit：For in the measurement circuitry that sensor and readout instrument are constituted by the characteristic information of accumulation signal
It is transformed to standard electric signal；
Controlled amplifier circuit：Control logic electric signal according to controller, induction coil after accumulation signal is terminated
Characteristic information is transformed to standard electric signal；
Controller：For judging whether accumulation signal terminates, and to controlled amplifier circuit and arithmetic processor output control logic
Electric signal；
Arithmetic processor：For the control logic electric signal according to controller, measurement represent accumulation signal standard electric signal and
Accumulation signal terminate after representative induction coil characteristic information standard electric signal, and to the standard electric signal at
Reason obtains the result about vibrating string type sensor system work condition；
Display：For showing the result that arithmetic processor is obtained.
7. vibrating string type sensor according to claim 6 work condition online testing device, it is characterised in that the exciting
The characteristic information of signal includes the one kind in voltage amplitude, current amplitude, voltage waveform, current waveform.
8. vibrating string type sensor according to claim 6 work condition online testing device, it is characterised in that the exciting
Signal pickup circuit includes amplitude detection circuit, and the amplitude detection circuit is connected with low speed low power differential amplifier；Or institute
Stating accumulation signal pick-up circuit includes the current sampling resistor amplitude detection circuit in parallel with the current sampling resistor, described
Amplitude detection circuit is connected with low speed low power differential amplifier；Or the accumulation signal pick-up circuit includes that high speed low power is differential
Amplifier；Or the accumulation signal pick-up circuit include high speed low power differential amplifier and with the differential amplification of high speed low power
Device current sampling resistor in parallel.
9. vibrating string type sensor according to claim 6 work condition online testing device, it is characterised in that described controlled
Amplifying circuit includes a signal amplification circuit, and the signal amplification circuit input connects controlled signal amplitude fading circuit.
10. vibrating string type sensor according to claim 6 work condition online testing device, it is characterised in that described to receive
Control amplifying circuit includes differential amplifier, and the differential amplifier is connected with voltage cut-out, the voltage cut-out and
The control logic electrical signal connection of controller.
11. vibrating string type sensor work condition online testing devices according to claim 6, it is characterised in that the control
Device processed includes level trigger.
12. vibrating string type sensor work condition online testing devices according to claim 6, it is characterised in that the control
Device processed includes digital signal processor, and the digital signal processor receives the data signal of analog-digital converter output.
13. vibrating string type sensor work condition online testing devices according to claim 6, it is characterised in that described to have
Closing the result of vibrating string type sensor system work condition includes that the representative induction coil feature after being terminated by accumulation signal is believed
The discrete waveform DS that the standard electric signal of breath is obtained by analog-to-digital conversion；Or the relevant vibrating string type sensor system
The result of the condition that works includes that the standard electric signal of the representative induction coil characteristic information after being terminated by accumulation signal passes through
Amplitude, frequency, amplitude decay rates, the width of the relevant waveform that the discrete waveform DS that analog-to-digital conversion is obtained is calculated
One kind in degree attenuation process in duration, signal to noise ratio, the frequency spectrum of exemplary amplitude scope；Or the relevant type vibration wire sensing
The result of device system work condition includes the representative coil after being terminated by the standard electric signal and accumulation signal that represent accumulation signal
Two groups of discrete waveform DSs that the standard electric signal of induced signal characteristic information is obtained by analog-to-digital conversion respectively are calculated
The impedance of measurement circuitry under the induced signal frequency for arriving.
14. vibrating string type sensor work condition online testing devices according to claim 6, it is characterised in that the fortune
Calculating processor includes arithmetic unit, and the arithmetic unit receives the data signal of analog-digital converter output.
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